package com.xuehu.java2;

import com.xuehu.java1.Person;
import org.junit.Test;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * 获取运行时类的方法结构
 */
public class MethodTest {

    @Test
    public void test1() {

        Class<Person> clazz = Person.class;

        //getMethods():获取当前运行时类及其所有父类中声明为public权限的方法
        Method[] methods = clazz.getMethods();
        for (Method m : methods) {
            System.out.println(m);
        }
        System.out.println();

        //getDeclaredMethods:获取当前运行时类中声明的所有方法。(不包含父类)
        Method[] declaredMethods = clazz.getDeclaredMethods();
        for (Method m : declaredMethods) {
            System.out.println(m);
        }

    }

    /**
     * 权限修饰符    返回值类型   方法名(参数类型1,形参1,.....) throws XxxException{}
     */
    @Test
    public void test2() {

        Class<Person> clazz = Person.class;

        Method[] methods = clazz.getDeclaredMethods();

        for (Method m : methods) {
            //1.获取方法声明的注解
            //因为方法会有多个额注解
            Annotation[] annotations = m.getAnnotations();
            for (Annotation a : annotations) {
                System.out.println(a);
            }

            //2.权限修饰符
            System.out.print(Modifier.toString(m.getModifiers()) + "\t");

            //3.返回值类型
            System.out.print(m.getReturnType().getName() + "\t");

            //4.方法名
            System.out.print(m.getName());
            System.out.print("(");

            //5.形参列表
            Class[] parameterTypes = m.getParameterTypes();
            if (!(parameterTypes == null && parameterTypes.length == 0)) {
                for (int i = 0; i < parameterTypes.length; i++) {
                    if (i == parameterTypes.length - 1) {
                        System.out.println(parameterTypes[i].getName() + " args_ " + i);
                    }
                    System.out.println(parameterTypes[i].getName() + " args_ " + i + ",");
                }
            }

            System.out.print(")");

            //6.抛出的异常
            Class[] exceptionTypes = m.getExceptionTypes();
            if (!(exceptionTypes == null && exceptionTypes.length == 0)) {
                System.out.print("throws ");
                for (int i = 0; i < exceptionTypes.length; i++) {
                    if (i == exceptionTypes.length - 1) {
                        System.out.print(exceptionTypes[i].getName());
                    }
                    System.out.println(exceptionTypes[i].getName() + ",");
                }

            }


            System.out.println();

        }


    }

}
